Map and autoclave: what they have in common

1. Step 1. Map — uses — Cartesian coordinates. Latitude and longitude.
2. Step 2. Cartesian coordinates — uses — Euclidean geometry. Analytic geometry.
3. Step 3. Euclidean geometry — is used in — Weather station. Instruments are set up on a site according to a standard.
4. Step 4. Weather station — has part — Barometer. A barometer.
5. Step 5. Barometer — works like — Manometer. Both measure pressure with a column of liquid: a barometer measures the air around us, a manometer the pressure inside a vessel.
6. Step 6. Manometer — is part of — Autoclave. The gauge shows whether the steam pressure in the chamber is high enough to sterilize.

Open Evothings